ANS:C - both (a) and (b)

(a) Shear Strength: Cohesionless soils, such as sands, rely primarily on interparticle friction to resist shear forces. When these soils become fully saturated with water, as in the quick condition, the water fills the void spaces between particles, reducing the effective stress and interparticle friction. As a result, the soil loses shear strength and becomes more prone to failure under applied loads or shear stresses. (b) Bearing Capacity: Bearing capacity refers to the ability of the soil to support applied loads without experiencing excessive settlement or failure. In the quick condition, the loss of shear strength in cohesionless soils can lead to reduced bearing capacity because the soil is less able to withstand the stresses imposed by the applied loads. As a result, structures founded on quick condition soils may experience increased settlement or instability, compromising their bearing capacity.